Which of the following pairs of spacetime events are separated by timelike, lightlike, and spacelike intervals? (these events are given by (ct, z, y,2) so you do not need to multiply the zeroth component by c). (a) (5,3,0,9) and (4,2,-1,8) (b) (8,6,7,5) and (10,7,8,6) (c) (2,3,6,0) and (0,3,7,0) (d) (-5,3,0,4) and (0,0,0,0) (e) (2,3,5,7) and (6,6,5,12)

How to tell if a molecule is polar or nonpolar with electronegativity

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.